Oiling device



P. W. BURKE AND A. J. BREEDiNG.

OILING DEViCE.

APPLICATION FILED MAY 26, 1921.

Patented July 18, 1922.

6 R. m m M m E N\ u mwm m m N m w ANDREW J. BREED/N6 A TTORN E Y.

cairn STATES PATENT OFFICE,

PETER WILLIAM BURKE AND ANDREN JACKSON BREEDING, OFBBEMERTON, VASE-I- INGTON, ASSIGNORS 0F ONE-THIRD TO FRANK ROGERS, OF BREMERTON, WASH- ING'ION.

OILING DEVICE.

Application filed May 26,

To all ro/tom it may concern:

Be it known that we, PETER WILLIAM BURKE and ANDREW JAoKsoN BREEDING, citizens of the United States, and residents of Bremerton, county of Kitsap, and State of Washington, have invented a new and useful Oiling Device, of which the following is a specification.

The present invention relates to improvements in oil feeding devices for pneumatic drills and similar tools actuated by the release of compressed air, and its particular object is to provide an automatic oil feeding device for the tools mentioned that will work automatically whenever the tool is being used, does not depend upon the diligence of the operator, delivers the oil to the parts needing it in a continuous flow or spray-like stream which can be adjusted to suit conditions, and, while using part of the compressed air for its distribution, does not lessen the efliciency of the tool owing to the fact that the supplying of oil in a steady flow to the vital parts of the tool during the time it is being operated lessens the friction and increases the ease of running of the machine to such an extent that it easily makes up for the diversion of a part of the compressed air.

While in the following description we are going to illustrate our device in connection with a pneumatic drill, we wish to have it understood that we donot confine ourselves in any way to the latter instrument but seek protection on the principle involved, without any reference to the particular tool selected for the purposes of illustration.

We attain these objects preferably by the mechanism illustrated in the accompanying drawing, inwhich Figure 1 represents a pneumatic drill having our device attached thereto, the latter'being shown partly in section, Figure 2 a detail side view, partly in section,,of an oil feed plug shown in Figure 1, Figure 3 a detail view of a valve used in our device, Figure 4 a detail sectional view of a plunger used in our device and shown in Figure 1, and Figure 5 an end view of the same.

Referring to the drawing in detail, we show the pneumatic drill 1, comprising the crank case 2, the cylinders 3 and the air chest Specification of Letters Patent.

Patented July 18, 1922.

1921. Serial No. 472,769.

a as principal parts, in general outlines only. From one side of the drill extends the throttle handle 6 through which compressed air is admitted into the air chest to actuate the several pistons in the cylinders in a manner well known in the art and therefore not described in detail, while opposite the same extends the dead handle 7 leading into the crank case and giving a convenient hold to the operator. Our invention consists, broadly speaking, in using this latter handle for an oil reservoir and in forcing the oil from there into the crank case by means of compressed air taken from the air chest. To accomplish this we introduce the oil feed plug 8 into the dead handle at a place near the crank case. This plug may be secured in the dead handle in any convenient manner and is here shown as having a central angular part adapted to be gripped by a monkey wrench and two threaded ends adapted .to be screwed into internally threaded ends of two adjoining parts of the handle. The particular manner of introducing the plug is of no importance, the principal point being that a solid part is provided in the handle near the crank case adapted to accommodate the various passages hereinafter referred to.

Between this plug and the outer end of the dead handle there is the tubular chamber 9, into which extends, centrally located, the smaller tube 11, one end of which is secured in the .plug, as shown at 10, while the other does not quite reach the outer end of the handle. On this tube reciprocates a plunger 12, which is shown in detail in Figures 4: and 5 and comprises a ring 14 fitting snugly on the tube 11 and extending from there to the inner circumference of the tubular chamber 9. To make the connections around the ring oiland air-tight we provide grooves 16 at either end of the ring covering almost the whole radial width of the rings and slanting into the peripheries. Into these grooves we fit leather rings 17 slightly exceeding the plunger in radial width so that their peripheral parts are bent outwardly and bear against the walls of the tubes in opposite directions. The two leather rings are firmly secured in their places by washers 18 and screws 19. y In this manner there will be at least one airand oil-tight leather packing no matter in which direction the plunger travels.

From the inner end of the tube 11 there eX- tends through the plug the passage 21 lead ing into the crank case. This passage is controlled by the valve shown in detail in Figure 8. The valve s here shown as a stud adapted to be inserted into a registering hole in the oil teed plug so as to cross the path of the passage 21. it is provided with a diametrical passage adapted to register with the passage 21. It is secured against longi tudinal motion in one direction by a nut engaging its threaded end 24c and in the opp'o site direction by a shoulder 26 engaging a corresponding shoulder in its seat. This shoulder, which is formed by cutting a segment out of the cross-section of the stud, at the same time limits the rotary motion of the stud, so that the latter can be turned sulliciently to perform its function as a valve in the passage 21, but not any further.

Another passage 27 in the oil feed plug leads from the tubular chamber 9 into the tube 28 connecting with the air chest t and also, through a passage 29, into the passage 21, close to the latters junction with the crank case. This latter passage 29 is controlled by a small gage screw 31.

The tube 11 is also provided, near its en trance into the oil teed plug, with a small perforation 32 adapted to allow oil to pass from the tube into the tubular chamber 9.

The device works as follows: To begin with, the outer end of the tubular chamber 9, is filled with oil, the plunger being moved as close to the plug as is feasible and leaving only a small empty space between the plunger and the plug. When the operator turns on his air, part of it will be used in actuating the pistons, while a smaller part will go through the passage 28 into the passage 27 where it will be divided up, the larger part going into the tube 9 and pressing against the plunger. The plunger, yielding to the pressure, forces the oil into the tube 11 and through the passage 21 into the crank case. In the meantime a smaller portion of the compressed air has entered the passage 21 through the passage 29, mixing with the oil passing through the passage and spreading the same all over the crank case. The supply of oil can be conveniently adjusted by the valve 22, while the supply of air bearing directly on the oil is subject to regulation by means of the gage screw 31.

When the air supply to the drill is stopped, the continued action of the pistons creates a partial vacuum in the air chest, in the tube 28, and in the air chamber between the plunger. 12 and the plug 8 and this vacuum draws oil through the perforation 32 from the tube 11 into the space rearward of the plunger, the tube 28 and the air chest 4, from where it is drawn through the valves to the pistons and from there to the exhaust, so that a complete circulation of the oil is provided for in our simple apparatus.

We claim: I

1. In a tool actuated by compressed air, a tubular oil chamber, a solid portion between said chamber and the working parts of the tool, a passage through said solid portion, a tube communicating with said passage eX- tending into the oil chamber, a plunger in said chamber adapted to reciprocate on the tube, and means for diverting a part of the compressed air to actuate said plunger and to thereby force oil from the oil chamber through the tube into the working parts of the tool.

In a tool actuated by compressed air, a tubular oil chamber, a solid portion between said chamber and the working parts of the tool, a passage through said solid portion, a tube communicating with said passage 6X- tending into the oil chamber, a plunger in said chamber adapted to reciprocate on said tube, means for diverting a part of the compressed air to actuate said plunger and to thereby force oil from the oil chamber through the tube into the working parts of the tool and valved means in said passage adapted to control the oil supply to the working parts.

3. In a tool actuated by compressed air, a tubular oil chamber, a solid portion between said chamber and the working parts of the tool, a passage through said solid portion, a tube communicating with said passage eX- tending into the oil chamber, a plunger in said chamber adapted to reciprocate on said tube, a second passage in said solid portion opening into the oil chamber and having a. gage-controlled comnuinication with said. lirst passage, and means for diverting a part of the compressed air into said passage so that one portion of the same actuates the plunger to force oil from the oil chamber through the tube into the working parts of the tool while another portion mixes with the oil in the first passage to properly distribute the same.

In a tool actuated by compressed air. a tubular oil chamber, a solid portion between said chamber and the working parts of the tool, a passage through said solid portion, a second passage in said solid portion opening into the oil chamber and having a communication with said first passage, means for diverting a part of the compressed air into the second passage so that one portion of the same forces oil from the oil chamber through the tube into the working parts of the tool while another portion mixes with the oil in the first passage to properly distribute the same, and valved means in said passage adapted to control the oil supply to the working parts.

5. In a tool actuated by compressed air, a

tubular oil chamber, a solid portion between said chamber and the working parts of the tool, a passage through said solid portion, a tube communicating with said passage extending into the oil chamber, a plunger in said chamber adapted to reciprocate on said tube, means for diverting a part of the compressed air to actuate said plunger and to thereby force oil from the oil chamber through the tube into the working parts of the tool, and a. perforation in said tube between the plunger and the solid portion adapted to allow oil to enter said space when the air pressure is released and to follow the path of the air when the pressure is changed to suction.

6. In a tool actuated by compressed air, a tubular oil chamber, a solid portion between said chamber and the working parts of the tool, a passage through said solid portion, a tube supported in said solid portion alined with said passage extending into the oil chamber, a plunger in said chamber adapted to reciprocate on said tube, means for diverting a part of the compressed air to actuate said plunger and to thereby force oil from the oil chamber through the tube into the working parts of the tool, valved means in said passage adapted to control the oil supply to the working parts, and a perforation in said tube between the plunger and the solid portion adapted to allow oil to enter said space when the air pressure is released and to follow the path of the air when the pressure is changed to suction.

PETER WILLIAM BURKE. ANDREW JACKSON BREEDING. 

